Improvement in work-holding devices



UNITEI) STATES PATENT @Prion FRANCIS E. HAHN, OF PHILADELPHIA,PENNSYLVANIA, ASSIGNOR TO OSCAR C. FERRIS AND FREDERICK B. MILES, OESAME PLACE.

IMPROVEMENT IN WORK-HOLDING DEVICES.

VSpecification forming part of Letters Patent No. 146,064, datedDecember 20, 1873; ap plication lcd August 4, 1873.

To all whom it may concern:

Be it known that I, FnANors E. HAHN, of Philadelphia, Pennsylvania, haveinvented a Compound Retaining Attachment for Drilling and otherMachines, of which the following is a speciiication: The object of myinvention is to provide drilling-machines, and other metal-workingtools, with an attachment which can be readily adjusted for the supportand retention of the different objects to be submitted to the action ofthe tool; and this object I attain by a block, A, fitted snugly, but soas to be turned freely, on a pin, B, which, in the present instance,forms a part of a swinging bracket, E, adapted to the column D of adrill-press, as shown in the perspective vieW,

Figure l, of the accompanying drawing, the

sides of the block being provided with diferent appliances forsupporting or retaining objects to be drilled, any of which appliancescan, by simply turning the block, be brought to a position beneath thedrill. One side of the block A is provided with a turn-table, a, whichtakes the place of the ordinary table of a drill-press. A second side isprovided with the jaws b b of a vise, one being ixed and the other beingmovable and controlled by a screw, in a manner too well known to needeither description or illustration. A third side is provided with anadjustable slotted plate, d, to which a variety of objects may beconveniently bolted, and a fourth side has a fixed head-stock, e, andsliding head-stock c', by and between the centers f f of which centeredspindles, and other objects which have been turned in a lathe, may beconfined by a screw forcontrolling the sliding` head-stock, in a mannerwhich needs no explanation. The block A may be adjusted on the pin B,from or toward the column D, to any desired point, and secured afteradjustment by a set-screw, w, passing through the block and entering oneof the longitudinal grooves in the pin B, (see side view, Eig. 2,) therebeing as many of these grooves on the pin as there are sides to theblock, and the grooves being so arranged, in respect to these sides, asto insure the proper position of whichever of the fourre-V tainingappliances may be uppermost when the end of the screw enters a groove.

In place of a screw, a key may be used for securing the block afteradjustment.

When the invention is applied to a drilli11g= machine, I prefer to soattach the bracket E, of which the pin B forms a part, to the` column orframe D, that it can be raised or lowered, or moved laterally, in thesame manner as the table of an ordinary drilling machine, as itfacilitates the" adjustment of the objects secured to the block in anydesired position beneath the drill. When the vise attachment, forinstance, is uppermost, andthe object to be operated on is confined byand between the jaws, every facility for adjustment is afforded by thelateral turning of thc'bracket E and by the sliding of the block on thepin B.

It will be evident `to those familiar with metalworking tools that myinvention may be used to advantage in connection with milling-machines,shaping-machines, and other like tools.

Although I prefer, in most cases, a block,

A, with four sides, and as many dierent appliances, in many instances ablock with but two or three different retaining appliances would formavaluable adjunct to a drilling or other metal-working machine, and, insome instances, an adjustable block with more than four retaining orsupporting appliances might be used.

It should be understood that I do not desire to restrict myself to anadjustable block with the special appliances herein describedto theexclusion 'of others for, in some` cases, a block might have two visesdifferently constructed for different kinds of work, or a block may haveslotted plates d, differing in character from that shown 5 in fact, theconstruction and style of the supporting and retaining appliances to beattached to the block will always depend upon the character of the workto be operated on by the'machine to which the block has to be applied.

I claim as my inventionl. The combination, in a drilling, milling, orother metalworking machine, rof ayertic-l al1y=adj ust-able bracket, E,its pin B, and the Q' Y mme;

block and grooves, all as set forth, for the purpose specified.

In testimony whereof I have signed my nam e to this specification in thepresence of two subscribing witnesses.

F. E. HAHN.

Witnesses 'WM. A. STEEL,

HUBERT HoWsoN.

